Stencil-printing machine



Sept 18, 1923.

I H. W. HAHN STENCIL PRINTING MACHINE Filed Dec. 5, 1921 4 Sheets-Sheet 1 INVEN T0 ATTORNEY Sept." 18, 11923.

H. W. HAHN STENCIL PRINTING MACHINE Filed Dec. 5, 1921 4 Sheets-Sheet 2 M R A ma H N H N E R W m m T vi A V wlllll lllllllllllllr I yum-I M 4 W 7 a 4 5 N 0 V & 9 T d 8 t m J N y QM MW a; E I. @U. h a W W 6 vgm 1 I ,AM, .W H WI, H H e e a A w E N m M a N M w M m H n w m w W m D 9 C 1. M h e M a T S W Sept. 18, 1923.

ATTORNEY;

H. W. HAHN STENCIL PRINTING MACHINE Sept. 18, 1923.

Filed Dec. 5, 1921 4 Sheets-Sheet 4 Y ATTORNEY.

Patented Sept. 18, W23.

iiiaiTaa TaTas PATENT names.

HN, OF LOS ANGELES, CALIFORNIA, ASSIGNOR T DAVID A. COLEMAN (30., INC, 0F LQS ANGELES, CALIFORNIA, A CORPORATION OF CALIFORNIA.

STENCIL-PRINTING MACHINE.

Application filed December 3, 1921. Serial ll'o. 519,612.

will do away with hand-operation, stencil ing an article quickly and accurately.

In practicing the invention I provide a machine adapted to automatically carry the object to be stenciled beneath the stencil member, then automatically return the member stenciled for the reception of another article to be stenciled. I

Heretofore in stenciling objects such as cardboard in the making of posters, it has been necessary for an operator to manually insert cardboardbeneath the stencil, then by hand run a scraper over the stencil so as to force color pigment through said stencil. After this is done the tray holding the article tobe stenciled is lowered and the operator removes said stenciled article by hand. This is a slow process, particularly where a number-of colors are to be applied to the poster, and makes the expense of producing the colored posters oftentimes prohibitive.

ation, with the possible exception of placing the article to be imprinted or stenciled upon the movable platen, is done away with. Obviously this hand-operation may be overcome by methods now generally used in the printing art, such as automatic conveyers feeding to the movable platen and then removing the article stenciled for further disposition.

The invention has for further objects the provision of an improved stencil machine which will be superior in point of relative simplicity and inexpensiveness, taken in conjunction with utility, durability and general 5 efiiciency and serviceability.

With the above and other objects in view,

the invention consists in the novel and use- With this machine all hand-operv ful provision, formation, construction, combination, association and interrelation of parts, members and features as illustrated in some of its embodiments in the accompanying drawings, described in the following detailed statement and finally pointed out in claims.

In the drawings;

Figure 1 is a fragmentary view, certain parts being sectioned, of an improved stenciling machine, and showing various mecha nisms for operating the same, said figure being on the line l1 of Figure 2, and looking in the direction of the appended arrows;

igure 2 is a front elevation, certain parts being sectioned, of the stenciling machine shown in Figure 1;

Figure 3 1s a view similar to Figure 1, but showing the platen in position for receiving an article to be stenciled;

Figure 4 is a phantom top plan view of the stencil machine; v

Figure fi is a fragmentary View showing certain means for operating a scraper member adapted to be passed over the stencil, said view looking in the direction of the arrows 5-5 in Figure 4;

Figures 6 and 7 are fragmentary views of ,the means for spreading ink'on the stencil;

Figure 8 is a fragmentary cross sectional View taken on the line 8--8 of Figure 6;

Figure 9 is a fragmentary perspective view of the movable platen and its bed, with means for raising and lowering said bed;

Figure 10 is a plan view of a stencil which may be utilized in conjunction with the machine for practicing the invention;

Figure 11 illustrates the method by which the scraper member moves in order to force color pigment through the stencil such as shown in Figure 10; and,

Figure 12 is a fragmentary detail of one of the brush sections for moving the color pigment over the stencil.

Corresponding parts in all the figures are designated by the same reference characters.

Referring with articularity to the drawings, the improve stencil machine is designated in its entirety by A, of which a is a movable platen, b a scraper member adapted to pass over the stencil carried by said platen, c the frame of said stencil machine,

d a bed blate, e a guide frame for the scraper b, and f, g and h cam members utilized for actuating the scraper member and the platen,-all of which elements are used in practicing one embodiment of the invention.

The frame may comprise two spaced members 1 and 2 having angled ends as 3150 give strength to the same, with the bases of said sides formed with angled feet 4 for properly supporting the entire frame. Upper and-lower cross bars 5 and 6 are bolted at their ends to the frame members 1 and 2 for maintaining the frame members rigidly spaced from each other. Each of the sides 1 and 2 likewise carries at portions thereof bearing parts 7, 8, 9 and 10, 7, 8, 9, 10. Shaft members 11, 12, 13 and 14, are carried in the respective bearing parts, as for instance, the shaft 11 is carried within the bearing parts 7 and 7, and so on for the other shafts. These shaft members tend to help strengthen and brace the sides 1 and 2 so that the entire structure when assembled, will be rigid and not vibrate excessively when the device is running.

The side members 1 and 2 of the frame member 0 are adapted to accommodate the bed plate d. Referring to Figure 9 it will be observed that the plated is provided with parallel side members 15 and 16 which are provided with outstanding lugs 17. The lug members 17 at each side are adapted to be received within slotted'guide plates 18 carried by the sides 1 and 20f the frame 0. Thus if the plate d were moved up and down thelugs 17 would be guided within the grooves or slots of the members 18, and allow the plate d to move directly up or down without side or tipping motion. Itwill be observed likewise upon referring to Figure 9' that the plate d is adapted to carry the platen member a. In order to do so the plate d has its side members 15 and 16 recessed as at 19 and the laten a is relieved as at 20 on each of its si es 21 and 22. This acts as a track for the platen and the plate ii in that the overhanging portion of the platen a, as at 23 for each side will ride on.

the top surface as 24-01? the sides 15 and 16 with the sides 15 and 16 bearing against the wall of the relieved portion 20 for each side. To insure that the platen a will not accidentally be removed from the plate (2 by excessive vibration or due to a tipping or twisting movement of either the platen a: or the plate at, the platen a is further relieved on each. side, as shown at 25. Within said relieved ortion is accommodated a long strip or plate member 26 with the said plate member detachably joined to the platen member a. This plate member in combination with the platen member forms a groove in the sides 21 and 22 of the platen a and the plate members 26 re accommodated within the grooved portions 19 of the aeasaa cils the device or card to be stenciled, as for instance is, is placed on the platen a and I held in position on said platen by means of stops 27. .The platen is then moved so as to be beneath the stencil member m and a scraper adapted to push ink is then-moved so as to force the ink through the stencil m to make an impression on the card it. Tt is therefore essential to so arrange the plate at and the platen a that after an impression has been made on the card In the late 03 will be lowered from the stencil m and the platen moved outwardly as illustrated in Figure 3 over two guide brackets 28 and 29 so that the operator may remove the card it and place a fresh card on the platen a, whereupon the platen is drawn upon the plate (Z and the plate elevated so as to place the card under the stencil m, whereupon the operation is repeated.

The bracket members 28 and 29; are formed with inwardly directed portions 30 corresponding in part to the top member of the sides 15 and 16 of the plate (1. In other words, when the plate d drops sufficiently, the portion 30 will be in alignment so as to be received within the relievedportion 20 of the platen a.

It willbe appreciated that-to accomplish a cycle of operations such as has been described will necessitate certain members adapted to raise and lower the plate d and operate the platen a. In other words there is a cycle of events and I have found it expedient to arrange the cam members 7 and 9 so they will produce a given motion of the arts a and d. Tn particular the cam memer f is mounted upon the shaft 14, and the cam member 9 is upon the shaft 12, the

shafts 14 and 12 carrying gear members 31 and 32, the teeth of which are in mesh.

The plate at i s'adapted to be actuated in its up and down movement by the cam member 7. This is accomplished by providing the plate member with a depending bracket 33 carrying a wheel member 34 which rides upon the eriphery of the cam f. It will be noted in igure 2 that there are in reality two cam members f, and two brackets provided with wheels 34,connected with the plate al. i

The plate d is cut awa as at 35 and the platen a is provided wit an arm member 36 having a bent extremity 37 the said arm member bein received within the cut. away portion 35. in arm 38 is pivotally carried on the shaft 13 at one end thereof, and the otherend of said arm is providedwith an angular extremity 39 with a portion of is termed the raise.

eeasea said arm provided with aslot 40. The arm 37 carries a roller 41 received within the confines of the slot 40. A-bell crank lever 42 is carried on the shaft 11, and a link arm 43 is pivotally joined to the arm 38 as at 44, and to the extremity of the longest arm of the bell crank lever, as at 45. The cam member (7 is carried upon the shaft 12, and it is to be noted that the cam g is of the grooved face or covered type, and the free end 46 of the short arm of the bell crank lever 42 carries a roller received Within the groove of said cam. The shaft 14 extends through the frame side 2 of the frame 0 and arries stepped pulleys 47, which pulleys are adapted to have a belt pass over a portion of the periphery for turning the said pulleys andin turn rotating the shaft 14 at any desired speed. If we neglect the remaining parts of the device for the present and trace the result of rotating the shaft 14, we Wlll then-understand to a certain extent the relation and relative movement that exists between the cam members f and g in actuating the platen a and the plate d. While I am not desirous of confining myself to exact forms of cams, such as that illustrated in the drawings, yet I have deemed it expedient for the purposes of this description to detail the exact form of said cam by stating the degrees of rotation and resultant movements of parts actuated by said cam. The cam {:has a 180 degree dwell at the point mar ed cm. This is the lower dwell and occupies approximately 1} of the cam periphery. Following this dwell is what ft is denoted by bb which is approximately 67-} degrees. The third portion of said cam known as a raised dwell, marked 00 occupies 1121} degrees. Taking the second cam we have a lower dwell of 180 degrees, as shown by dd followed by a forward portion designated as ee of 671} degrees. There is then a forward dwell as shown at ff of 22% degrees, and a return movement designated gg of 90 degrees. Assuming that the cams are in the position illustrated in Figure 1 and the shaft rotated clockwise, as indicated by the arrow above the gear wheel 32, the gear 31 Wlll be rotated anti-clockwise. The plate (Z is about to be lowered from the raised dwell to the lower dwell of the cam f and quite obviously the shaft 14 will rotate about 15 degrees anti-clockwise from the position shown 1n Figure 1 in the lowering of the plate d. While the plate 01 is lowering the cam g is rotating and the bell crank 42 is being moved through the medium of the roller mem ber 46 carried by the bell crank following the groove in said cam. The part ee causes an upward movement of the long arm of the bell crank lever which moves the arm 38 anti-clockwise and in turn moves the plate (i outwardly upon the bracket members 28 and 29. Meanwhile the cam f has rotated 67 degrees 30 minutes on its lower dwell, and by the time the roller 46 reaches the point at the cam marked ff the platen is at its limit of forward, movement over the brackets 28 and 29, as shown in Figure 3. The part ff is called the forward dwell and this dwell exists, as stated, for 22%- degrees of rotation. During this dwell an operator has'time in whi'ch'to remove the card is from the platen a, which card has been stenciled, and place a new one thereon, whereupon the cam will continue to rotate and reach the gg portion thereof, known as the return. By the time traverse of the gg portion is completed the platen a is over the plate d and the cam f has completed rotation of the act portion and the roller 34 is about to engage the b?) portion of the same cam, which will lift the plate d upwardly carrying the platen a with it. While this is occurring the roller 46 is on the dd ortion and continues on said portion until the cam f has rotated through the co portion whereupon the cycle of operations is repeated. It is to be noted that the roller member 41 slides within the slot 40, as illustrated in Figure 3 during movement of the platen a. Briefly expressed, the move ment is as follows: First, the plated lowers to a definite pointso that the tops 30 of the brackets 28 and 29 are in' alignment with the tops 24 of the sides 15 and 16, whereupon the plate will remain stationary while the platen moves outwardly upon the brackets 28 and 29, then stops its movement for a period of time, then commences its return until it is directl over the plate (2, whereupon the plate will be elevated and lift the platen upwardly to a given position. It

is perhaps unnecessary to state that in the embodiment shown the gears 31 and 32 are in a one-to-one relation. The members a and d are shown flanged on their end sur- 1faces in order to give strength to said memers.

To properly stencil the card is it is of course necessary to provide a stencil m which is immediately above the card is and so arranged that ink may be passed through said stencil to give an impression on the card. It is desired to perform the stencil operation automatically and to accomplish an automatic action the scraper I) is so arranged and carried and guided by the guide frame 6 with the scraper actuated by suitable gears and the cam h, asto cause said scraper to pass over the stencil pushing ink before it during the elevated position of the platen beneath the stencil. In detail the scraper b may comprise two opposed plate members 48 and 49, one of which as 48 is keyed to a shaft 50. It is to be noted that there are two plates 49, and the said plates 49, as well as the plate 48 are undercut as at 51. Received on opposite sides of the plates within theundercut portions 51 and projecting outwardly from end portions of said plates, are the scraper brushes proper 52. The plates 49 are detachably held to the plate 48 as by means of screws 53. Upon reference to Figure 2 it will be noted that there are a number of scraper members b, as shown at 54 extending along the shaft 50. The shaft 50 is carried by the frame e in a manner to be described. First, the frame a on both of its sides has provided an angled top as shown in Figures 2 and 8 at 55, and on said angled portion is accommodated what may be termed a rack bar support 56.

When I refer to the singular wish to include both sides-1 and 2 of the frame member c. The rack support 56 is formed with angled ends 57 and 58, and the said rack support is grooved longitudinally as at 59 and so as to receive a long rack bar 61 and a short rack bar in the respective grooves. The ends 57 and 58 of said rack bar support 56 are cut awayin alignment with the grooves 59 and 60 so that the rack bars 61 and 62 may project beyond the ends of said rack bar support 56. Supported upon and by the ends 57 and 58 and immediately above and in parallel alignment with the rack bar support 56 is a plate 63, said plate being held to the ends in any suitable manner, as by means of screws or otherwise, and the said plate 63 is provided with projecting ends 64 and 65. The plate 63 is slotted longitudinally, as-shown at 66 (see Figs. 4 and 8). Immediately above the plate 63 and spaced from said plate. is a second plate 67 provided with a longitudinal slot 68, which slot lies directly over and parallel with the slot 66. The plate 67 is supported on the projecting ends 64 and of the plate 63. Within the space included between the two plate members 63 and 67, which space I will designate by 69, is received the shaft member 50, which shaft carries a. brush gear 70 which is confined within the slotted portions 66 and 68 with the teeth of said gear in mesh with the teeth of the short rack bar 62. A roller member 71 is carried at the end of the shaft and held thereto by suitable means as 72, with the said roller member confined between the plates 63 and 67 as shown at 73, the roller member contracting with the plate 63. Likewise carried-on the shaft 50 and received between the plates 63 and 67, as at 74, is what ma be termed a brush brake 75, which brush rake includes two members adapted to have a close working fit between the plates 63 and 67, for reasons to be described later. As previously stated, the opposite side 1 of the frame member a carries mechanism similar to the mechanism just described. The end 57 of the rack support likewise carries a bearing plate 76, and a shaft 77 extends from the frame side 1, to

the frame side 2 and is carried within the;

bearing plates 76. Gears 78 are carried upon said shaft so that their teeth may mesh with the teeth of the long rack bar 61. An end as 79 of said shaft 77 carries a pinion 80. Joined to the frame side 2 and likewise to the bearing plate 76 is a rack bar housing 81, which is slotted for a portion as 82 so a to receive a portion of the pinion 80. A rack bar 83 is received within said housing and has its teeth in mesh with the pinion 80. An end as 84 of said rack bar 83 carries a roller 85 received within the grooved portion 86 of the covered cam h.

The cam h is carried on the outer side of the frame side 2 upon a stud shaft 87. There is likewise carried on said stud shaft a gear 88 which in turn meshes with an idler 89 carried upon a stud shaft 90 with the idler 89 in mesh with a gear 91 carried on the shaft 12. The gear ratio is such that the gear 88, or rather the shaft 87, will turn onehalf as fast as the shaft 12. In other words, the gear 32 will make two revolutions to every one revolution of the gear 88.

, efore describing in detail the exact function to be performed by the cam 71. or the mechanism actuated thereby, it is deemed expedient to describe the remaining features and show the relation that exists between the remaining features of the machine and all of the elements just described. The rack bar 62 is provided with a projecting member 92 and the lon rack bar 61 is provided with a plurality o spaced transverse openings 93. As shown in Figure 8 a springpressed projection 94 is adapted to be received within the confines of each opening 93. Pin members 95 formed with annular grooves are adapted to be placed within oertain'of the openings 93, so that an end thereof may contact with the projection 92, where 3 desired, with the annular groove of said pin members engaged by the projection 94 so as to lock the pin members within the openings of the rack bar 61.

Extending between the sides 1 and 2 and carried b the rack support members are front an rear stencil supports 96 and 97. These stencil supports may be suitably held to the rack supports asby means of screws 98. The stencil supports are shown in the form of angle irons. r The stencil m which includes the bolting cloth 99 joined to a suitable frame 100 has its frame ends received within the stencil supports 96 and 97, as shown in the figures. It is perhaps unnecsar to describe the stencil member m in detai as it is constructed in a well-known manner. The platen a is channeled as shown at 101 and 102 so as'to receive the base mem aeeaeea I 70 to be stenciled, and ensures proper stencil 10 further turn of the gear 31, the platen will move outwardly upon the brackets-29 and 30, and a new card will be placed upon the platen, the platen returned. over the plate (I, and the platen then raised beneath the stenoil m. During all of this time the scraper b has remained idle without movement. When the card is immediately beneath the stencil m the brush will rotate from the position shown in Figure 6 to the position shown in Figure 7 and commence movement across the stencil m pushing ink 103 before it, which ink passes through the stencil cloth and makes an impression upon the card. After the scraper has made its movement across the stencil it ceases moving, whereupon the plate 03 lowers, carrying with it the platen a, the platen moves from the plate outwardly upon the brackets, the stencil card It is removed and a fresh card is is placed upon the platen, whereupon the cycle of movement is repeated, and the scraper 6 makes a turning movement from the position shown in Figure 7 to the position shown in Figure 6 and passes over the stencil as before. To accomplish this cycle of movement the cam It is constructed in the following manner: That portion of the cam h designated as 7th is termed the small dwell and is approximately 123 degrees and minutes. The second portion y'j has a raise of 56 degrees and 30 minutes, immediately followed byan upper dwell k of 123 degrees 30 minutes, followed by a lowering mm of 56 degrees and 30 minutes, Referring to Figure 1 the gear 88 will be rotated in the direction of the arrow indicated above said gear, which of course will rotate the cam h in the same direction. The rack bar 83 carrying the roller 85 will remain stationary while the roller traverses the groove 86' at the part marked hit. As the cam rotates further, the roller will encounter the part jj, which will elevate the rack bar 83 and in so elevating the rack bar the pinion 80 keyed to the shaft 5 77 will rotate, turning the shaft, and in turn rotating the gear 78. The rotation of the pinion 80 and the gear 7 8 will be anti-clockwise or opposite to the direction of rotation of the gear 88. As the gears 78 are meshing with the teeth of the long rack bars 61 the long rack bars will be drawn to the right. This is true for the reason that the gears 78 are held in a fixed position and the rack bars 61 are slidable within the grooves 59'of the rack supit will be seen upon reference to port plates 56. Referring to Figure 10 it will be seen that only a portion of said stem-=- cil cloth contains a pattern marked U. S. patents. As a result there would be little use in scraping the ink 103 across the entire face of the stencil cloth. It is to overcome the necessity of passing the scraper over the stencil cloth at the pattern point that the second rack bars 62 are utilized. The stop pins are placed in the openings 93 of the long rack bar, so that the long rack bar will have to move a certain distance before said stop pins will contact with the projections 92 carried by the rack bars 62. When this occurs the small rack bars willbe moved in unison with movement of the long rack bars, and as the brush brake 75 is in frictional engagement with the plates 63 and 67, movement of the scraper b will be retarded, which will cause the gear or pinion 70 to rotate from the position shown in Figure 6 to the position shown in Figure 7, whereupon the scraper b will move a definite distance across the stencil m so as to pass the ink 103 through the pattern and thus make an impression upon the card is. A stop pin 95 would be placed on the opposite side of the projection 92 so that a reverse movement of the scraper would take place when the scraper b is moved'in an opposite direction,

which of course would be accomplished by the rack bar 83 being lowered as the cam it rotates, which lowering of the rack bar would turn the gear 78 anti-clockwise.

To trace-the relations that now exist be tween the movement of the cams f, and h igure 1 that the cam h is at the commencement of its small dwell hk. During this small dwell the scraper of course will not move, but the platen and plate will move, that is, the plate (Z will lower and the platen a will move out upon the brackets for reception of a card, then the platen will return over the plate at the time the roller 34 reaches the part marked 66 of'the cam f, and at the time the roller member 46 reaches the point marked 99 of the cam g. By the time the cam f has moved through the part marked 66 and the earn 9 marked gg and a part of dd, in other words, the cams f and 9 have moved 247 degrees, the cam It has moved through hit, or 123 degrees and 30 minutes. The roller 85 will then traverse the art jy' and as the movement of the cam k is 'alf the movement of the cams f and g, the cams f and y will move through the raised dwell cc of and the remaining lower dwell (id of the cam g. This movement, as stated, causes the scraper b to move to the right in the plane of Figure 1. The roller 85 is then received in the upper dwell 707a which causes the scraper to lremain stationary during further movement of the platen and plate part ,mm, whereupon the scraper b will retrac its movement to the left.

,New scrapers b are easily replaced as they are made in sections, as illustrated in Figure 2. In fact, the various parts of the entire machine are readily replaced.

I do not wish to be understood as con-' 1 wish to protect is a stencil machine which operates automatically to pass ink through a stencil without the neoesslty of moving the scraper by manual means over the stencll. I likewise wish to protect by this invention the automatic feedin of the card to be stenciled beneath the stencil, and a return of the platen carrying the card properly stenciled for the reception of a new card to be stenciled. lhe machine likewise contemplates a Scraper member which passes ink through the stencll at the cut-away or pattern portion of the stencil without the said scraper passing completely river the face of said stencil, as well as an automatically operating scraper member which reverses the direction of the scraper so .tliat the ink may be properly pushed ahead of said scraper during operation of the entire machine.

A machine of this character is a great time-saver in that it does away with hand operation and will turn out many hundreds of stenciled articles in a shorter period of time than heretoforeable of accomplishment.

It is obvious that many changes and variations and modifications may be made in departure from the particular description and showing of the accompanying drawings, in.

adapting the invention to varying conditions and requirements of use and service, without departing from the true spirit of the invention.

Having thus disclosed m invention, I claim and desire to secure by tters Patent: 1. A stencil printing machine, comprising -a frame, a bed plate and a platen carried thereon, a stencil and a scraper adapted to be pased over said stencil to force ink through said stencil; there being means for raising and lowering said bed plate and platen, and means for moving said platen from beneath the stencil, so that an article to, stenciled may be placed on said platen.

2. A stencil rinting machine, comprising a frame, a be plate and a platen carried thereon; a stencil and a scraper adapted to be passed over said stencil to force ink through said stencil; there being means for raising and lowering said bed plate and platen, and means for moving said platen meaaee from beneath the stencil,"so that an article to be stenciled may be placed on said platen; said first means permitting the bed plate to dwell on its lowered position during the movement of the platen, said bed plate raising when the platen upon its return movementis directly over said bed plate.

3. A stencil printing machine, comprising a frame, a bed plate and a platen carried thereon; a stencil and a scraper adapted to be passed over said stencil to force ink through said stencil; there bein means for raising and lowering said be plate and platen, and means for moving said platen from beneath the stencil, so that an article to be stenciled may be placed on said platen; said platen being over said bed plate during the stenciling operation.

4. A stencil printing machine, comprising a frame, a bed plate and a platen carried thereon; a stencil and a scraper adapted to be passed over said stencil to force ink through said stencil, there being means for raising and lowering said bed plate and platen, and means for moving said platen from beneath the stencil, so that an article to be stenciled may be placed on said platen; said first means permitting the bed plate to dwell on its lowered position during the movement of the platen, said bed plate raising when the platen upon its return movement is directly over said bed plate; said scraper moving across the stencil in one direction after "one complete raising and lowering of the bed plate and platen.

5. A stencil printing machine, having in combination, a member adapted to hold an article to be stenciled, a stencil and means adapted to automatically pass over saidsten oil for forcing ink therethrough for appli cation to the article to be stenciled; said means comprising a Ejcraper; .there being forcing ink throughthe stencil and upon the" member to be stenciled; there being means for moving said scraper over a definite area of the stencil, and means for lowering the platen from beneath the stencil and for moving said platen into such position that the stenciled article may be removed'and a new article to be stenciled placed thereon.

7 In a stencil printing machine, the combination, of a platen and a stencil; said .platen being adapted to carry an article to be stenciled, said article being received between said stencil and platen, and a scraper member adapted to pass over said stencil for A aeeasec 8. In a stencil printing machine, the combination, of a platen and a stencil; said platen being adapted to carry an article to be stenciled, said article being received between said stencil and platen, and a scraper member adapted to pass over said stencil for forcing ink through the stencil and upon the member to be stenciled; there being means for moving said scraper over a definite areaof the stencil, and means for lowering the laten from beneath the stencil and for movmg said platen into such positionthat the stenciled article may be removed and a new article to be stenciled placed thereon; there being a bed plate upon which the platen rests when beneath the stencil; and means for raising and lowering the bed plate whereby the platen is raised and lowered; said means permitting the bed plate to rest in the lowered position during independent move ment of the platen.

9. In a stencil printing machine, the combination, of a platen and a stencil; said platen being adapted to carry an article to be stenciled, said article being received between said stencil and platen, and a scraper member adapted to pass over said stencil for forcing ink through the stencil and upon the member to be stenciled; there being means .for moving said scraper over a definite area of the stencil, and means for lowering the platen from beneath the stencil and for moving said platen into such position that the stenciled article may be removed and a new article to be stenciled placed thereon; there being a bed plate upon which the platen rests when beneath the stencil; and means for raising and lowerin the bed plate whereby the platen is ralsed and lowered; said means permitting the bed plate to rest in the lowered position during independent movement of the platen; said scraper moving across said stencil in one direction after completion of movement of the platen'and bed plate incident to supplying an article to bestenciled. Y

= 10. Ina stencil printing machine, the combination, ofa member adapted to hold an article to be stenciled, a stencil member, and a scraper member adapted to pass over said stencil to force ink through said stencil for. application to the member to be stenciled; there being means for automatically moving said scraper member across said stencil; and means for restricting movement of said scraper member, whereby the scraper moves over a determined area of the stencil.

11. In a stencil printing'machine, the combination, of a member adapted to hold an article to be stenciled, a stencil member, and a scraper member adapted to pass over said stencil to force ink through said stencil for application to the member to be stenciled; there being means for automatically moving said scraper member across said stencil; and means for restricting movement of said scraper member, whereby the scraper moves over a determined area of the stencil; said means for moving said scraper member comprising a movable rack bar, and a pinion carried by the scraper member meshing with said rack bar.

12. In a stencil printing machine, the combination; of a member adapted to hold an artcle to be stenciled, a stencil member, and a scraper member adapted to pass over said stencil to force ink through said stencil for application to the member to be stenciled; there being means for automatically moving said scraper member across said stencil; and means for restricting move ment of said scraper member, whereby the scraper moves over a determined area of the stencil; there being a shaft forsaid scraper, a pinion mounted on said shaft, a rack bar the teeth of which are in mesh with said inion, the shafting being limited in rotation to cause reversal of the scraper; there being means for moving said rack bar whereby the scraper member is moved across the stencil.

13. A stencil printing machine, having in combination, a supportmg frame, a member adapted to hold an article to be stenciled, a stencil, and a scraper member adapted to pass over said stencil for forcing ink through the stencil for application to thearticle to be stenciled; there being a slotted uide frame carried by the frame memberan said scra er being provided with means receivable in said slot for guiding movement of the scraper member across the stencil.

14. A stencil printing machine, having in combination, a supportm frame, a member adapted to hold an artic e to be stenciled, a stencil, and a scraper member adapted to pass over said stencil for forcing ink through the stencil for application to the article to be stenciled; there being a guide frame carried by the frame member for guiding movement of the scraper member across the stencil; there being a shaft 11 on which said scraper member is mounte and means for rotating said shaft to reverse the position of the scraper at the end of each excursion of the scraper across the stencil.

15. A stencil printing machine, having in combination, a supporting frame, a member adapted to hold an articleto be stenciled, a stencil, and a scraper member adapted to pass over said stencil for forcing ink through the stencil for application to the article to be stenciled; there being a guide frame carried by the frame member for guiding movemnt of the scraper member across the stencil; there being a shaft upon which said scra er member is mounted; and

' means for rotating said shaft to reverse the position of the scraper at the end of each excursion of the scraper across the stencil; said means comprisin a pinion mounted on said shaft, a rack ar, the teeth of'which are in mesh with said pinion, and

means for moving said rack bar.

16. In a stencil printing machine, the comforcing ink through said stencil, said scra er' being provided with a shaft, and a guide frame member adapted to receive one end of said shaft; said uide frame member being plurally slotte there being a brush brake carried by the shaft and received slidably in part of such slotted portion of one of the guide frame members, and a pinion carried on the shaft received in the other part of the slotted portion, a short rack bar having its teeth in mesh with said pinion, and means for moving said shortvrack bar whereby the scraper will first rotate then move across the stencil. v 17. In a stencil printing machine, the combination,jwith a stencil and an automatic scraper adapted to pass over said stencil for forcing ink through said stencil, said scraper being provided with a shaft, and aguide frame member adapted to receive one end of said shaft; said guide frame member being plurally slotted; there being a brush brake carried by the shaft and received slidably in part of such slotted portion of one of the guide frame members, and a pinion carried on the shaft received in the other part of the slotted portion, a short rack bar having its teeth in mesh with said pinion, and means for moving said short rack bar whereby the scraper will first rotate then move across the stencil; said brush brake retarding move ment of the scraper until the scraper has partially rotated.

18. In a stencil printing machine, the combination, with a stencil and an automatic scraper adapted to pass over said stencil for forcin ink through said stencil, said scraper being provided with a shaft, and a guide frame member adapted to receive one end of said shaft;,said guide frame member being plurally slotted; there being a brush brake carried by the shaft and received slidably in art of such slotted portion of one of the gui e frame members, and a pinion carried on the shaft received in the other and means for moving said shorti rack bar whereby the scraper will first rotate then move across the stencil; a second rack bar, and means for moving said second rack bar, said means for moving the short rack bar comprising a pin carried by the second rack bar adapted to engage the first rack bar to move the same at a determined time.

19. In a stenciling machine, a reversible scraper mounted to travel over a stencil in opposite directions, means for producing excursions of the scraper, said scraper having separate working portions, andvmeans for causing such working portions to be alternately applied to the stencil during a complete excursion of the scraper; said last named means being operated by the operation of said first named means.

20. In a stenciling machine, a reversible scraper mounted to travel over a stencil in opposite directions, ,means for producing excursions of the scraper, said scraper having separate working portions, and means for causing such working portions to be alternately applied to the stencil during a complete excursion of the scraper; said last named means being operated by the operation of said first named means; said scraper being mounted on a shaft provided with a pinion, and a rack bar meshing with said pinion; frictional means being provided yieldingly holding said shaft in osition during partial rotation of said sha to reverse said scraper, and permitting said shaft and scraper to move after such reversal.

21. In a stencil printing machine, the combination, with a stencil and a scraper adapted to pass over said stencil. to force ink through the stencil; said scraper being provided with a shaft, a pinion carried on said shaft, a first rackbar, the teeth of which are inmcsh with the teeth of the pin-' ion, a second rack bar, there being means of engagement between the first and second rack bars whereby said first rack bar will be moved upon movement of the second rack bar, a second pinion in mesh with said second rack bar and means for rotating said second pinion in one or the other direction tomove the second rack bar, whereby the scraper is passed back and forth over the stencil. Y

22. In a stencil printi n machine, thecombination, with a stenci and a scraper ,said shaft, a, first rack bar, the teeth of bar, a second pinion in mesh with said Seeond rack bar and means for rotating said second pinion in one or the other direction to move the second rack bar, whereby the scraper is passed back and forth over the stencil; there being a shaft upon which said second pinion is mounted and a third pinion ,carried on said shaft; there being a reciprocal rack bar in mesh with said third pinion and means being rovidedfor moving said last named rack ar.

- 23. In a stencil printing machine, the combination, with a stencil and a scraper adapted to pass over said stencil to force ink through the stencil; said scraper being provided with a shaft, a pinion carried on said shaft, a first rack bar, the teeth of which are in mesh with the teeth 'of the pinion, a second rack bar, there being means of engagement between the first and second rack bars whereby said first rack bar will be moved upon movement of the second rack bar, a second pinion in mesh with said second rack bar and means for rotating said second pinion in one or the other direction to move the second rack bar, whereby the scraper is passed back and forth over the stencil; said means of engagement between the first and second rack bars being adjustable, whereby said second rack bar may move a determined distance before moving the first rack bar.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

HARRY W. HAHN.

Witnesses:

J. CALVIN BROWN, J 3 Smrrr. 

